Yep, you have to get a software download, and the downloads for the accessories aren't available to we independent shops who pay for VADIS and WSDA. I have installed three trailer hitches on S80's, but they were installed for the purpose of bike racks so lighting wasn't an issue. I think the only reason a download is needed is to keep the bulb integrity light from staying on...I would think power (and this is an assumption) would travel through wires regardless...unless Volvo has figured out a way to break the universal laws of physics...
Hope this helps,
Chris
|